Keywords: 
• triphenyltin /
• Thalassiosira pseudonana /
• growth inhibition /
• photosynthesis inhibition

Abstract: Triphenyltin (TPT) is a widely distributed pollutant in coastal environment in China. In the present study, its toxicity to the growth and photosynthesis of the marine diatom Thalassiosira pseudonana at different temperatures (i.e., 10 ℃, 15 ℃, 25 ℃ and 30 ℃) were investigated. Results showed that TPT had significant inhibition effect on both the growth and the photosynthesis at 30 ℃, while the photosynthesis was not affected by TPT at relative low temperatures. The IC₅₀ values of TPT for growth inhibition tests were 1.81, 1.69, 1.09 and 0.73 μg·L^-1 at 10 ℃, 15 ℃, 25 ℃ and 30 ℃, respectively. Similarly, the IC₅₀ values for photosynthesis inhibition test decreased with the increase of temperatures. Two-way ANOVA analysis revealed that there was significant interaction effect of temperature and TPT concentrations on the growth and photosynthesis of T. pseudonana. Temperature-dependent toxicity patterns were species-specific. The pattern observed for T. pseudonana in this study was similar as that for the invertebrates (i.e., the marine copepod Tigriopus japonicus and the rotifer Brachionus koreanus), but it was different from the marine medaka Oryzias melastigma. The overall results of the present study can provide useful references for understanding the toxic effect of TPT on the algae species under different temperatures.